閱讀下面短文,從短文中所給各題的四個選項（A、B、C和D）中,選出可以填入空白處的最佳選項.
Signs made up mainly of circles,cross,or arrows,which can occasionally be seen at the entrance of a house.36 that a tramp（流浪漢） has been there.This special
sign-language is often by tramps to tell their 37 whether the people living in a certain house are hospitable（好客的） or unfriendly,and save them the trouble of making unnecessary 38 .
Quite by chance one day,I 39 a real tramp.He is such a rare sight these
days that I stopped and 40 him from some distance away.He was dressed
just as a tramp would be,in patched trousers and a jacket many sizes 41 big for him.On his head there was a shabby hat and his boots were so worn that they were almost coming 42 pieces.But the man himself looked 43 ,as if he had not a care in the world.He put down a small bag by the front gate,and began 44 the sign left by a previous（先前的） caller.Although the sign was 45 to me,it must have been favourable to him,for his face lit up with 46 .He entered the gate and rang the bell.When the door opened,I saw him 47 his hat.But the conversation that took place
was very 48 indeed,for before he said a few words,the door shut loudly in his face.I felt very sorry for him 49 he walked sadly out of the house.But just as
quickly,his face lit up again and he moved 50 towards the gate.51 he stopped,looked at the sign and shook 52 seriously as if he had made a big mistake.
Digging deep into his pockets,he took out a piece of 53 ,rubbed out the existing sign and 54 a new one in its place.Then he 55 his things and began walking to the next house,whistling as he went along.
36.A.prove B.suggest C.explain D.warn
37.A.fellows B.readers C.families D.masters
38.A.calls B.cook C.quarrels D.visits
39.A .came across B.came over C.went through D.went over
40.A.saw B.noticed C.watched D.examined
41.A.as B.about C.too D.so
42.A.from B.to C.in D.by
43.A.happy B.unhappy C.disappointed D.anxious
44.A.drawing B.wiping C.using D.studying
45.A.meaningless B.known C.interesting D.new
46.A.anger B.hope C.satisfaction D.fear
47.A.rise B.pull C.hold D.push
48.A.discouraging B.short C.successful D.special
49.A.since B.though C.after D.as
50.A.slowly B.directly C.sadly D.angrily
51.A.Where B.There C.When D.So
52.A .his hands B.the gate C.his head D.a tree
53.A .chalk B.wood C.bread D.cake
54.A.changed B.formed C.developed D.made
55.A.found B.held C.looked for D.collected
求詳解,謝蛤~
主要是37~39題，若有詳解更好，呵呵